<template>
  <div class="progress" @click.stop="point" ref="progress">
    <div class="progress-line"></div>
    <div class="progress-bg" :style="{ width: progressWidth }">
      <div class="progress-btn" @mousedown.self.stop="move()" v-if="isShowBtn"></div>
    </div>
  </div>
</template>

<script setup>
import { ref } from 'vue';
import { defineProps, defineEmits } from 'vue';

const props = defineProps({
  progressWidth: {
    type: String,
    default: '0'
  },
  isShowBtn: {
    type: Boolean,
    default: true
  }
});

const emit = defineEmits();

const progress = ref(null);

// 进度条拖拽
const move = () => {
  document.onmousemove = (e) => {
    setProgressLine(e, false);
  };

  // 拖拽进度条的时候 禁止页面文字选中
  document.body.onselectstart = () => false;

  document.onmouseup = (e) => {
    // 拖拽结束时设置当前音频时间
    setProgressLine(e);
    document.onmousemove = document.onmouseup = document.body.onselectstart = null;
  };

  return false;
};

// 点击音频进度条
const point = (e) => {
  setProgressLine(e);
};

const setProgressLine = (e, flag = true) => {
  const $progress = progress.value;
  // 实时获取鼠标横坐标，若是超过进度条最大宽度，则值为进度条的宽度
  const curProgress = Math.min(
    Math.max(e.clientX - getOffsetLeft($progress), 0),
    $progress.offsetWidth
  );

  emit('setProgressLine', { val: curProgress / $progress.offsetWidth, flag });
};

// 获取元素到浏览器左侧距离
const getOffsetLeft = (obj) => {
  let oLeft = obj.offsetLeft;
  let oParent = obj.offsetParent;

  while (oParent !== null) {
    oLeft += oParent.offsetLeft;
    oParent = oParent.offsetParent;
  }

  return oLeft;
};
</script>
<style scoped lang="scss">
.progress {
  position: relative;
  width: 100%;
  height: 4px;
  padding: 4px 0;
  border-radius: 2px;
  cursor: pointer;

  .progress-line {
    position: absolute;
    top: 4px;
    left: 0;
    width: 100%;
    height: 4px;
    border-radius: 2px;
    background: #eee;
    box-shadow:0 0 4px #efefef inset;
  }

  .progress-bg {
    position: absolute;
    top: 4px;
    left: 0;
    width: 0;
    height: 4px;
    border-radius: 2px;
    background: -moz-linear-gradient(left, #ff641e 0%, rgba(255, 150, 0, 0.77) 10%, rgba(255, 100, 30, 0.8) 50%, #ff641e 70%, #ff7832 100%);
    /* FF3.6-15 */
    background: -webkit-linear-gradient(left, #ff641e 0%, rgba(255, 150, 0, 0.77) 10%, rgba(255, 100, 30, 0.8) 50%, #ff641e 70%, #ff7832 100%);
    /* Chrome10-25,Safari5.1-6 */
    background: linear-gradient(to right, #ff641e 0%, rgba(255, 150, 0, 0.77) 10%, rgba(255, 100, 30, 0.8) 50%, #ff641e 70%, #ff7832 100%);
    /* W3C, IE10+, FF16+, Chrome26+, Opera12+, Safari7+ */
    filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#ffffff', endColorstr='#ff7832', GradientType=1);
    /* IE6-9 */
  }

  .progress-btn {
    position: absolute;
    right: -5px;
    width: 11px;
    height: 12px;
    border: 4px solid var(--color-text-height);
    top: -5.5px;
    background: #f94141;
    box-shadow: 0 0 15px 0 rgb(0 0 0 );
    transition: all 0.3s;
    border-radius: 50%;
    cursor: grab;
  }
}
</style>
